
Calendar.setup = function (params) {
	function param_default(pname, def) {
		if (typeof params[pname] == "undefined") {
			params[pname] = def;
		}
	}
	param_default("inputField", null);
	param_default("displayArea", null);
	param_default("button", null);
	param_default("eventName", "click");
	param_default("ifFormat", "%Y/%m/%d");
	param_default("daFormat", "%Y/%m/%d");
	param_default("singleClick", true);
	param_default("disableFunc", null);
	param_default("dateStatusFunc", params["disableFunc"]);	// takes precedence if both are defined
	param_default("dateText", null);
	param_default("firstDay", null);
	param_default("align", "Br");
	param_default("range", [1900, 2999]);
	param_default("weekNumbers", true);
	param_default("flat", null);
	param_default("flatCallback", null);
	param_default("onSelect", null);
	param_default("onClose", null);
	param_default("onUpdate", null);
	param_default("date", null);
	param_default("showsTime", false);
	param_default("timeFormat", "24");
	param_default("electric", true);
	param_default("step", 2);
	param_default("position", null);
	param_default("cache", false);
	param_default("showOthers", false);
	param_default("multiple", null);
	param_default("ondatechange", null);
	var tmp = ["inputField", "displayArea", "button"];
	for (var i in tmp) {
		if (typeof params[tmp[i]] == "string") {
			params[tmp[i]] = document.getElementById(params[tmp[i]]);
		}
	}
	if (!(params.flat || params.multiple || params.inputField || params.displayArea || params.button)) {
//		alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
		return false;
	}
	/**
	 * Added by Debenson 
	 
		 if (params.ondatechange) {
			if (params.inputField.attachEvent) { // IE
				params.inputField.attachEvent("onchange", params.ondatechange);
			} else {
				if (params.inputField.addEventListener) { // Gecko / W3C
					params.inputField.addEventListener("onchange", params.ondatechange, true);
				} else {
					params.inputField["onchange"] = params.ondatechange;
				}
			}
		}
	*/
	if (params.ondatechange) {
		params.inputField["onchange"] = params.ondatechange;
	}
	function onSelect(cal) {
		var p = cal.params;
		var update = (cal.dateClicked || p.electric);
		if (update && p.inputField) {
			p.inputField.value = cal.date.print(p.ifFormat);
			if (typeof p.inputField.onchange == "function") {
				p.inputField.onchange();
			}
		}
		if (update && p.displayArea) {
			p.displayArea.innerHTML = cal.date.print(p.daFormat);
		}
		if (update && typeof p.onUpdate == "function") {
			p.onUpdate(cal);
		}
		if (update && p.flat) {
			if (typeof p.flatCallback == "function") {
				p.flatCallback(cal);
			}
		}
		if (update && p.singleClick && cal.dateClicked) {
			cal.callCloseHandler();
		}
	}
	if (params.flat != null) {
		if (typeof params.flat == "string") {
			params.flat = document.getElementById(params.flat);
		}
		if (!params.flat) {
			alert("Calendar.setup:\n  Flat specified but can't find parent.");
			return false;
		}
		var cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect);
		cal.showsOtherMonths = params.showOthers;
		cal.showsTime = params.showsTime;
		cal.time24 = (params.timeFormat == "24");
		cal.params = params;
		cal.weekNumbers = params.weekNumbers;
		cal.setRange(params.range[0], params.range[1]);
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.getDateText = params.dateText;
		if (params.ifFormat) {
			cal.setDateFormat(params.ifFormat);
		}
		if (params.inputField && typeof params.inputField.value == "string") {
			cal.parseDate(params.inputField.value);
		}
		cal.create(params.flat);
		cal.show();
		return false;
	}
	var triggerEl = params.button || params.displayArea || params.inputField;
	triggerEl["on" + params.eventName] = function () {
		var dateEl = params.inputField || params.displayArea;
		var dateFmt = params.inputField ? params.ifFormat : params.daFormat;
		var mustCreate = false;
		var cal = window.calendar;
		if (dateEl) {
			params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
		}
		if (!(cal && params.cache)) {
			window.calendar = cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect, params.onClose || function (cal) {
				cal.hide();
			});
			cal.showsTime = params.showsTime;
			cal.time24 = (params.timeFormat == "24");
			cal.weekNumbers = params.weekNumbers;
			mustCreate = true;
		} else {
			if (params.date) {
				cal.setDate(params.date);
			}
			cal.hide();
		}
		if (params.multiple) {
			cal.multiple = {};
			for (var i = params.multiple.length; --i >= 0; ) {
				var d = params.multiple[i];
				var ds = d.print("%Y%m%d");
				cal.multiple[ds] = d;
			}
		}
		cal.showsOtherMonths = params.showOthers;
		cal.yearStep = params.step;
		cal.setRange(params.range[0], params.range[1]);
		cal.params = params;
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.getDateText = params.dateText;
		cal.setDateFormat(dateFmt);
		if (mustCreate) {
			cal.create();
		}
		cal.refresh();
		if (!params.position) {
			cal.showAtElement(params.button || params.displayArea || params.inputField, params.align);
		} else {
			cal.showAt(params.position[0], params.position[1]);
		}
		return false;
	};
	return cal;
};

